siemens



' Patented May 2, I899.

\ F. NS.

REGENE E URNAGE. (Application filed Oct. 22, 1898.)

RAT

3 Sheets-Sheet l.

(No Model.)

Patented May 2, I899.

F. SIEMENS. BEG EN'ERATIVE FURNACE.

(Ap plicatiozl filed Ot. 22, 1898.)

3 Sheets-Sheet 2.

( No Model.)

No. 624,388. Patented May 2, I899.

- r. suzmzus.

BEGENERATIVE FURNACE.

(Application filed Oct. 22, 1898.)

3 Sheets-Sheet 3.

(No Model.)

I I g I 1 1%; ass es W UNITED STATES PATENT OFFICE.

FREDERICK SIEMENS, OF DRESDEN, GERMANY.

REG EN ERATIVE FURNACE.

SPECIFICATION forming part of Letters Patent No. 624,388, dated May 2, 1899.

Application filed October 22, 1898. Serial No. 694,2931 (No model.)

ing the gas-producers arranged close to the beds, with reversing-valves both for gas and air, and provided with means for working with hot or cold air alone or when desired with air more or less mixed with hot products ofcombustion. In the specification No. 11,433 of 1896 is described an arrangement of two separate gas-producers and their valves in such a way that one of them can be worked alone while the other is being cleaned or repaired. It is found, however, that unless these producers are made considerably larger than is necessary for. ordinary working the stoppage of one of them makes a difference in the working of the furnace which is practically objectionable. Again, furnaces of the kind described'when applied for heating piles of iron or steel are conveniently worked in such a manner that while the heated metal is being removed from part of the bed near the one end metal is being heated near the other end. As, however, whenthe metal has attainedits full heat before its removal from the bed the air-supply has to be very much lessened in order to avoid overheating and oxidation of the heated metal, and the flame at the other end is lowered in temperature owing to the deficient supply of air.

The present invention relates to certain modifications of producers and furnaces of the kind referred to, so as to provide for maintaining sufficient heat when it is necessary to clean or repair the producers or to lessen the air-supply at the end of the furnace-bed.

line 1 1 of Fig. 2, which is a horizontal section on the line 2 2 of Fig. 1, and Fig. 3 is a transverse section onthe line 3 3 of Fig. 1, of a furnace and producers according to this inven tion.

Three or more (as shown in the drawings five) producers P are arranged in a row behind the furnace-chamberF F parallel toits length. Between the row of producers and the structure forming the back of the furnace chamber there are formed two fiues A and B. The lower flue A communicates with the spaces below the fire-grates of all the producers P by openings provided with valves or dampers 0., and the upper flue B communi-- cates with the upper parts of all the producersP by openings provided with valves or dampers b. In Fig. 3 the lower and upper openings to one of the producers-that on the left-are shown closed, those tothe others being open.

At each end of the. lower flue A there is an inlet for air governed by a damper a, and near the ends there are passages r r from the regenerative chambers R R injectors r 0 being arranged for impelling through;

municate with the furnace-chamber F F. by

the flu es 11 H and they communicate in the usual way with the outer air and with a chimney by passages governed by valves at V.

At about the middle of the length of the furnace-chamber F F there is formed in the roof a flue D, having openings 0 down into the chamber. This flue communicates with an inlet provided with a valve (2 through a set of pipes E, which extend through the re generators R R I The apparatus works as follows: The producers P, having their lower spaces supplied with air only or with the addition of some of the products of combustion from one regen becomes heated in passing through the regen erator and enters the fu mace-chamber by the due H over the'entering gas, mingling with it and producing flame and hot combustion 1o gases which sweep through the furnace-chamher and pass by the flue H through the regenerator R and thence to the chimney. When the one regenerator becomes cooled and the other heated, the valves at V and g are changed, so as to send air to the regenerator R and flue H and gas to the flue G while the products of combustion from the furnace-chamber pass through the regenerator R. Some of the products of combustion may then be sent into the fine A and the pro- 3o absence of one out of three or more does not' ducers by putting the injector r in action. So far theoperation is the same as that ofregenerative gas-furnaces of-ordinary construction.

When it happens that any one of the producers requires to be cleaned or repaired, its valves a and b are closed, and the rest of the producers continue in action and may be urged somewhat more than usual, so that the materially aitect the working of the furnaces.

When the furnace is employed for heating piles, ingots, or other pieces of metal, it is often necessary to reduce the air-supply when the pieces at the one endsay in the part Fare sufliciently heated and are about to be taken out, otherwise;-if the air were supplied in' full measure, the metal would be more or less oxidized. In consequence of deficiency of air the other part F of the furnace, which may have just been charged with pieces to be heated, would receive onlya dull flame incapable of giving the heat desired. In that case'the valve dis opened, so that air becoming heated in passing along the pipes E enters the furnace-chamber by the openings in the root from the flue D and supplies the dull flame as it passes With additional air,

so. that the flame becomes more intense and the part F and its charge are effectually heated. Having thus described the nature of this invention and the best means I know for carrying the same into practical effect, I claim 1. A regenerative gas-furnace consisting of af'urnace-chamber, in combination with two air-regenerators, a plurality of gas-producers arranged in a row parallel with the length of the chamber, each producer having itslower part. communicating by a valved opening with a lower flue, a lower flue communicating by passages provided with injectors with the two air-regenerators, and an upper flue communicating 'by a valved opening with the upper parts of all the gas-producers and with each of the gas-fines leading to the respective ends of the fu mace-chamber, substantially as described.

2. The combination with the f u rnace-chamber and the upper and lower fines, and the regenerative chamber, of the plurality of gas-producers behind the furnace-chamber, the lower flue communicating by openings with the spaces below the fire-grates of all the gas-producers, valves for said openings, and the upper flue communicating with the upper parts of all the gas-producers by openings having valves, passages from the regenerative chambers to each end of the lower fine, injectors disposed at openings near the ends of said flue, for impelling the products of combustion through said passages, fiues connecting the regenerators with the furnacechamber, a flue in the roof of the'furnacechamber having openings directly into said chamber and air-pipes extending through the regenerators and having a valve and connected with the flue in the roof of the furnacechamber, all as and for the purpose specified.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FREDERICK SIEMENS.

Witnesses:

O. MUsoHLIoH, HERNANDO DE SOTO. 

